Pipe-expander.



K. J. THORSBY.

PIPE EXPANDER.

APPLICATION FILED JAN. 24, 1914.

Ru 1 9 1 am 2 r a M d .w n 8 LIU a P i l l r fl/ 4? 4,2 x Am l/VVE/VTOR MZ w? A w 4 I v ATTORNEY K. J. THORSBY.

PIPE nxmnnm. APPLIOATION FILED JA 24. 1 14. Patented Mar. 23, 1915.

2 SHEETS-SHEET 2.

' l/VVE/VTOR Kat/1 $4M;

KARL JoHAN THORSIBY, or OAKLAND, CALIFORNI ASSIGNOR r o LIronNIA conr RUGATED CULVERT- COMPANY, or OAKLAND, CALIFORNIA, A, oonroRA'rIo or CALIFORNIA.

PIPE-EXPANDER.

ran srATEs PATENT FFIC Application filed January 24, 1914. Serial No. 814,094.

To all whom it may concern a subject of the King of Norway, residing at Oakland, in the county of Alameda and lis the frame, which in this instance is a cylinder provided with side ears 2. I

3 is what is known as an ordinary stakeriveter, which is a stock having members 4 formly in circular shape. When the expan- State of California, have invented certain which are used to manufacture the pipe 5. 60: new and useful Improvements in Pipe-Ex- To this stake-riveter the cylinder 1 is fixed panders, of which the following is a specifiby the lag-bolts 6 inthe cylinder ears. cation. are the expansion-members. These are My invention relates to pipe-expanders. arms, each having at its inner end a cir- It is particularly adapted for use in concular bearing 8 pivoted upon a pintle 65.; nection with the manufacture of corrugated which lies within the cylinder and has a culvert pipes, or pipes of comparatively movement therein parallel with its axis. The 1 small diameter and heavy plates. outer end of each of the arms is provided with In the manufacture of corrugated culvert a head 10 having a sharp edge 11 in order pipe, it is customary to construct the pipe to prevent it from slipping when forced from a plurality of sections which overlap against the pipe 5. WVithin the cylinder 1 or telescope their adjacent ends. An end is a piston 12, in which is carried the pintle of each section must, therefore, in order o 9. Springs 13 are connected to the piston admit of this overlap, be expanded or opened and to the arms, to bring the arms back 20 up sufficiently to slip over the end of the adagain from their divergent angle, which jacent section. This operation takes conthey assume when expanding the pipe. Se- 1 siderable time and labor, especially when cured to the end of the cylinder 1 and crossdone by hand, which is the general method. ing it between the arms is a'bar 14:, which By my invention this objection is overcome, not only prevents the piston from being 2 and the necessary expansion is effected withforced out of the'cylinder, but also acts as 1 out loss of time and with a minimum of a guide for the arms 7, in such a way as to labor. prevent. said piston from twisting, thus This is the object of my invention, and keeping both piston and arms in the desired to this end my invention consists in a novel position.

30 pipe-expander as I shall hereinafter fully 15 is apipe leading from a source of fluid describe by reference to the accompanying pressure, say steam or water, or, preferdrawings, it being understood that only the ably, air. best form of the device is herein illustrated 16 is a valve to control the admission and and that many changes and variations. are exhaust of the fluid, and 17, is a pipe which I r 35 possible without departing from the scope leads the fluid to the port 17 in the cylinof the appended claims. der below the piston. In cases where the In the drawings Figure 1 is an elevation diametersof the pipes vary, a distance piece" of my pipe expander showing it in place in 18 is used. This consists of a turnable screw the pipe and ready for operation. Fig. 2 is post or column having a head 19 fitted to a 40 a vertical section of the expander showing dovetail 20 on the base of the cylinder and the expansion arms in elevation and proprovided with a foot 21 to rest in the pipe. jected to expand the pipe. Fig. 3 is a ver- The operation is as follows: When the tical section at right-angles to Fig. 2, showvalve 16 is opened, the pressure fluid enters ing the expander and the means for fixing it the bottom of the cylinder through the pipe 45 in place in the pipe. Fig. lis a top viewof 17, and forces the piston outward. This the expander. F ig. 5 is a fragmentary view movement of the piston carries the arms 7 of the expander showing the application outward, until their heads 10 contact with thereto of a distance-piece. I the pipe 5. Further movement causes the V The expander comprises, in general, a heads to grip the pipe and to force or ex- 1 frame, means for positioning the frame in pand its walls outto greater diameter, the the pipe, expansion-members carried by the arms 7 diverging as they" turn about their frame, and means for operating said mempintle 9. But as a certain resistance is hers. In particular, and in the best form, offered by the pipe, said pipe "will, under 55 fhese essential parts of the device are as folthe pressure of the arms 7, expand unino sion is completed, and the adjacent pipe section is slipped in, the valve 16 is turned to cut off the fluid pressure to the cylinder, at the same time opening the exhaust therefrom. The piston then falls back to its original position, and the springs 13, which on the outward movement had been con densed, will by their expansion bring back the arms 7 toward each other.

I claim 1. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion-members movable in the cylinder; a piston in the cylinder coacting with the expansion members to force them against the pipe to expand it; and means for operating the piston.

2. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion-members movable in the cylinder; means for fixing the cylinder in said pipe; a piston in the cylinder coacting with the expansion members to force them against the pipe to expand it; and means for operating the piston.

3. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion members movable in the cylinder; a piston in the cylinder coacting with the expansion members to force them against the pipe to expand it; springs to return the expansion members when thepressure of the piston is relieved; and means for operating the piston.

4. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; means for fixing the cylinder in said pipe; expansion members movable in the cylinder; a piston in the cylinder coacting with the expansion members to force them against the pipe to expand it; springs to return the expansion members when the pressure of the piston is relieved; and means for operating the piston.

5. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion-arms pivotally connected at their inner ends for divergence and approach, the pivotal connection of said arms being fitted in the cylinder and having a movement therein parallel with its axis; a piston in the cylinder coacting with the arms and adapted to move them outward to their engagement with the pipe; and means for operating the piston.

6. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion-arms pivotally connected at their inner ends for divergence and approach. the pivotal connection of said arms being fitted in the cylinder and having a Copies of this movement therein parallel with its axis; a piston in the cylinder coacting with the arms and adapted to move them outward to their engagement with the pipe; springs to return the arms when the pressure of the piston is relieved; and means for operating the piston.

7 In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion-arms pivotally connected at their inner ends for divergence and ap proach, the pivotal connection of said arms being fitted in the cylinder and having a movement therein parallel with its axis; a piston in the cylinder coacting with the arms and adapted to move them outward to their engagement With the pipe; and means for operating the piston, consisting of a fluidpressure connection to the cylinder.

8. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion-arms pivotally connected at their inner ends for divergence and approach, the pivotal connection of said arms being fitted in the cylinder and having a movement therein parallel with its axis; a piston in the cylinder coacting with the arms and adapted to move them outward to their engagement with the pipe; a cross bar secured to the end of the cylinder between the arms; and means for operating the piston.

9. In a pipe-expander, the combination of a cylinder adapted to be fitted within the pipe; expansion-arms pivotally connected at their inner ends for divergence and approach, the pivotal connection of said arms being fitted in the cylinder and havi g a movement therein parallel with its axis; a piston in the cylinder coacting with the arms and adapted to move them outward to their engagement with the pipe; springs to return the arms when the pressure of the pis ton is relieved; a cross bar secured to the end of the cylinder between the arms; and means for operating the piston.

10. In a pipe-expander, the combination of a frame adapted to be fitted within the cylinder; expansion-arms carried by the frame; means for forcing said arms to bear against the pipe to expand it; and an adjustable spacing piece fitted to the base of the frame to adapt it for different diameters of pipes.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

KARL J OHAN THORSBY.

Witnesses:

S. A. Form, C. R. HODGKI'N.

Commissioner of Patents,

Washington, DC. 

